Datamax W-Class Maintenance Manual page 87

Removal and Replacement
7. Reattach the Tensioner Spring to the Upper Belt Tensioner.
8. Route the Timing Belt under the Pulley Clutch Assembly.
9. Allow the Tensioner Spring to adjust the belt; then tighten both Upper Belt Tensioner screws.
10. Plug in and turn 'On' the printer. With media loaded, press the FEED key several times. Recheck the
belt tension. If necessary, repeat beginning with Step 9; otherwise continue.
11. Turn 'Off' and unplug the printer.
12. Replace the covers; see Section 4.1.
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